Bail piece refers to a document recording the nature of the bail which is granted to a defendant in a civil action. Generally, a bail piece is filed with a court. It is usually signed by the defendant’s sureties. A bail piece is not simply an authority for arrest, but is considered a evidence of the relationship between the parties.
The following is a case law defining bail piece:
A bail piece is an instrument whereby, the bail have a right to demand of the officer taking the recognizance, stating that the principal is delivered to the bail. It is the evidence of their right to his/her custody; it is delivered to them, and not filed in court, unless upon a surrender of the principal. [Elliott v. Dudley, 8 Mich. 62, 65 (Mich. 1860)].